Bael-7439-intro-to-etcd (#15892)

* Update pom.xml

* Create JetcdExample.java

libraries-data-io/pom.xml

@@ -95,6 +95,12 @@
             <artifactId>protobuf-java</artifactId>
             <version>${google-protobuf.version}</version>
         </dependency>
+        <!-- jetcd core api -->
+        <dependency>
+            <groupId>io.etcd</groupId>
+            <artifactId>jetcd-core</artifactId>
+            <version>${jetcd-version}</version>
+        </dependency>
     </dependencies>
 
     <properties>
@@ -110,6 +116,7 @@
         <yamlbeans.version>1.15</yamlbeans.version>
         <apache-thrift.version>0.14.2</apache-thrift.version>
         <google-protobuf.version>3.17.3</google-protobuf.version>
+        <jetcd-version>0.7.7</jetcd-version>
     </properties>
 
 </project>

libraries-data-io/src/main/java/com/baeldung/etcd/JetcdExample.java

@@ -0,0 +1,32 @@
+package com.baeldung.etcd;
+
+import java.util.concurrent.CompletableFuture;
+
+import io.etcd.jetcd.kv.GetResponse;
+import io.etcd.jetcd.ByteSequence;
+import io.etcd.jetcd.KV;
+import io.etcd.jetcd.Client;
+
+public class JetcdExample {
+    public static void main(String[] args) {
+        String etcdEndpoint = "http://localhost:2379";
+        ByteSequence key = ByteSequence.from("/mykey".getBytes());
+        ByteSequence value = ByteSequence.from("Hello, etcd!".getBytes());
+
+        try (Client client = Client.builder().endpoints(etcdEndpoint).build()) {
+            KV kvClient = client.getKVClient();
+            
+            // Put a key-value pair
+            kvClient.put(key, value).get();
+            
+            // Retrieve the value using CompletableFuture
+            CompletableFuture<GetResponse> getFuture = kvClient.get(key);
+            GetResponse response = getFuture.get();
+            
+            // Delete the key
+            kvClient.delete(key).get();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}